Phylum: Charophyta   Family: Desmidiaceae

Cosmarium cyclicum P. Lundell 1871

West & West (1905: p. 145, pl. 58: 8-9) provide no records for the whole of Scotland. An Arctic-alpine species that prefers sub-atmophytic habitats and ephemeral water-bodies. It would seem to be quite rare and infrequently recorded.

References: 
Lundell, P.M. (1871) De Desmidiaceis, quae in Suecia inventae sunt, observationes criticae.
Kouwets, F.A.C. (in manuscript) European Flora of the Desmid Genus Cosmarium.
West, W. & West, G.S. (1905) A Monograph of the British Desmidiaceae, Volume 2.